We have learned in the class that corporate social responsibility includes economic growth, social and environmental limits. I think environmental concern is the most important aspect with respect to sustainability. Being sustainable requires a business to go green, using environmentally friendly in production process. One interesting fact I found when I was reading an article is that many entrepreneurs now are focused not on solar and the other usual suspects of green building, but on the mundane stuff or existing materials. For example, some innovators take wood from old barns and other buildings and reuse into flooring and paneling. Some others are taking the wool from sheep that is used to be discarded and using it as building insulation to replace fibreglass. There are innovative ways that allow entrepreneurs to make use of typical stuff that we see in daily life.  In such a market that encourages green movement, entrepreneurs should engage in a profusion of new materials or new uses for old materials in order to exploit the full potential of limited resources to perform its corporate social responsibility.